1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <network_helpers.h>
4 #include "kfree_skb.skel.h"
5
6 struct meta {
7 int ifindex;
8 __u32 cb32_0;
9 __u8 cb8_0;
10 };
11
12 static union {
13 __u32 cb32[5];
14 __u8 cb8[20];
15 } cb = {
16 .cb32[0] = 0x81828384,
17 };
18
19 static void on_sample(void *ctx, int cpu, void *data, __u32 size)
20 {
21 struct meta *meta = (struct meta *)data;
22 struct ipv6_packet *pkt_v6 = data + sizeof(*meta);
23 int duration = 0;
24
25 if (CHECK(size != 72 + sizeof(*meta), "check_size", "size %u != %zu\n",
26 size, 72 + sizeof(*meta)))
27 return;
28 if (CHECK(meta->ifindex != 1, "check_meta_ifindex",
29 "meta->ifindex = %d\n", meta->ifindex))
30 /* spurious kfree_skb not on loopback device */
31 return;
32 if (CHECK(meta->cb8_0 != cb.cb8[0], "check_cb8_0", "cb8_0 %x != %x\n",
33 meta->cb8_0, cb.cb8[0]))
34 return;
35 if (CHECK(meta->cb32_0 != cb.cb32[0], "check_cb32_0",
36 "cb32_0 %x != %x\n",
37 meta->cb32_0, cb.cb32[0]))
38 return;
39 if (CHECK(pkt_v6->eth.h_proto != htons(ETH_P_IPV6), "check_eth",
40 "h_proto %x\n", pkt_v6->eth.h_proto))
41 return;
42 if (CHECK(pkt_v6->iph.nexthdr != 6, "check_ip",
43 "iph.nexthdr %x\n", pkt_v6->iph.nexthdr))
44 return;
45 if (CHECK(pkt_v6->tcp.doff != 5, "check_tcp",
46 "tcp.doff %x\n", pkt_v6->tcp.doff))
47 return;
48
49 *(bool *)ctx = true;
50 }
51
52 /* TODO: fix kernel panic caused by this test in parallel mode */
53 void serial_test_kfree_skb(void)
54 {
55 struct __sk_buff skb = {};
56 LIBBPF_OPTS(bpf_test_run_opts, topts,
57 .data_in = &pkt_v6,
58 .data_size_in = sizeof(pkt_v6),
59 .ctx_in = &skb,
60 .ctx_size_in = sizeof(skb),
61 );
62 struct kfree_skb *skel = NULL;
63 struct bpf_link *link;
64 struct bpf_object *obj;
65 struct perf_buffer *pb = NULL;
66 int err, prog_fd;
67 bool passed = false;
68 __u32 duration = 0;
69 const int zero = 0;
70 bool test_ok[2];
71
72 err = bpf_prog_test_load("./test_pkt_access.bpf.o", BPF_PROG_TYPE_SCHED_CLS,
73 &obj, &prog_fd);
74 if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
75 return;
76
77 skel = kfree_skb__open_and_load();
78 if (!ASSERT_OK_PTR(skel, "kfree_skb_skel"))
79 goto close_prog;
80
81 link = bpf_program__attach_raw_tracepoint(skel->progs.trace_kfree_skb, NULL);
82 if (!ASSERT_OK_PTR(link, "attach_raw_tp"))
83 goto close_prog;
84 skel->links.trace_kfree_skb = link;
85
86 link = bpf_program__attach_trace(skel->progs.fentry_eth_type_trans);
87 if (!ASSERT_OK_PTR(link, "attach fentry"))
88 goto close_prog;
89 skel->links.fentry_eth_type_trans = link;
90
91 link = bpf_program__attach_trace(skel->progs.fexit_eth_type_trans);
92 if (!ASSERT_OK_PTR(link, "attach fexit"))
93 goto close_prog;
94 skel->links.fexit_eth_type_trans = link;
95
96 /* set up perf buffer */
97 pb = perf_buffer__new(bpf_map__fd(skel->maps.perf_buf_map), 1,
98 on_sample, NULL, &passed, NULL);
99 if (!ASSERT_OK_PTR(pb, "perf_buf__new"))
100 goto close_prog;
101
102 memcpy(skb.cb, &cb, sizeof(cb));
103 err = bpf_prog_test_run_opts(prog_fd, &topts);
104 ASSERT_OK(err, "ipv6 test_run");
105 ASSERT_OK(topts.retval, "ipv6 test_run retval");
106
107 /* read perf buffer */
108 err = perf_buffer__poll(pb, 100);
109 if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
110 goto close_prog;
111
112 /* make sure kfree_skb program was triggered
113 * and it sent expected skb into ring buffer
114 */
115 ASSERT_TRUE(passed, "passed");
116
117 err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.bss), &zero, test_ok);
118 if (CHECK(err, "get_result",
119 "failed to get output data: %d\n", err))
120 goto close_prog;
121
122 CHECK_FAIL(!test_ok[0] || !test_ok[1]);
123 close_prog:
124 perf_buffer__free(pb);
125 bpf_object__close(obj);
126 kfree_skb__destroy(skel);
127 }
128
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